Why do file sizes change when I use "Process Multiple Images" to add watermarks?

Hi,
I'm using Elements 11. In order to add watermarks to many JPG pics at once, I use the function "Process Multiple Files".
I select a source folder and a destination folder, and adds a three digit serial number to each file. I do NOT tick the checkbox marked "Change picture size". After that I define the watermark I want printed on my pics and hits OK. All the files in the source folder are processed and saved, with a new name in the destination folder. Fair and square.
But. The file size of the new file is heavily reduced, compared to the original. It goes from 10 MB down to 500 KB (in general). Why is that? Is there any way I can prevent it?
Regards,
/Mikael Lindgren

Or you can uncheck the convert files box to save them in their original format, or select one of the lossless formats PSD, BMP, TIF. What is most appropriate depends on what you intend to do with the watermarked versions.
Cheers,
Neale
Insanity is hereditary, you get it from your children
If this post or another user's post resolves the original issue, please mark the posts as correct and/or helpful accordingly. This helps other users with similar trouble get answers to their questions quicker. Thanks.

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LivelyJamesS wrote:
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